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Linux/include/rdma/rdmavt_mr.h

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  1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
  2 /*
  3  * Copyright(c) 2016 Intel Corporation.
  4  */
  5 
  6 #ifndef DEF_RDMAVT_INCMR_H
  7 #define DEF_RDMAVT_INCMR_H
  8 
  9 /*
 10  * For Memory Regions. This stuff should probably be moved into rdmavt/mr.h once
 11  * drivers no longer need access to the MR directly.
 12  */
 13 #include <linux/percpu-refcount.h>
 14 
 15 /*
 16  * A segment is a linear region of low physical memory.
 17  * Used by the verbs layer.
 18  */
 19 struct rvt_seg {
 20         void *vaddr;
 21         size_t length;
 22 };
 23 
 24 /* The number of rvt_segs that fit in a page. */
 25 #define RVT_SEGSZ     (PAGE_SIZE / sizeof(struct rvt_seg))
 26 
 27 struct rvt_segarray {
 28         struct rvt_seg segs[RVT_SEGSZ];
 29 };
 30 
 31 struct rvt_mregion {
 32         struct ib_pd *pd;       /* shares refcnt of ibmr.pd */
 33         u64 user_base;          /* User's address for this region */
 34         u64 iova;               /* IB start address of this region */
 35         size_t length;
 36         u32 lkey;
 37         u32 offset;             /* offset (bytes) to start of region */
 38         int access_flags;
 39         u32 max_segs;           /* number of rvt_segs in all the arrays */
 40         u32 mapsz;              /* size of the map array */
 41         atomic_t lkey_invalid;  /* true if current lkey is invalid */
 42         u8  page_shift;         /* 0 - non unform/non powerof2 sizes */
 43         u8  lkey_published;     /* in global table */
 44         struct percpu_ref refcount;
 45         struct completion comp; /* complete when refcount goes to zero */
 46         struct rvt_segarray *map[];    /* the segments */
 47 };
 48 
 49 #define RVT_MAX_LKEY_TABLE_BITS 23
 50 
 51 struct rvt_lkey_table {
 52         /* read mostly fields */
 53         u32 max;                /* size of the table */
 54         u32 shift;              /* lkey/rkey shift */
 55         struct rvt_mregion __rcu **table;
 56         /* writeable fields */
 57         /* protect changes in this struct */
 58         spinlock_t lock ____cacheline_aligned_in_smp;
 59         u32 next;               /* next unused index (speeds search) */
 60         u32 gen;                /* generation count */
 61 };
 62 
 63 /*
 64  * These keep track of the copy progress within a memory region.
 65  * Used by the verbs layer.
 66  */
 67 struct rvt_sge {
 68         struct rvt_mregion *mr;
 69         void *vaddr;            /* kernel virtual address of segment */
 70         u32 sge_length;         /* length of the SGE */
 71         u32 length;             /* remaining length of the segment */
 72         u16 m;                  /* current index: mr->map[m] */
 73         u16 n;                  /* current index: mr->map[m]->segs[n] */
 74 };
 75 
 76 struct rvt_sge_state {
 77         struct rvt_sge *sg_list;      /* next SGE to be used if any */
 78         struct rvt_sge sge;   /* progress state for the current SGE */
 79         u32 total_len;
 80         u8 num_sge;
 81 };
 82 
 83 static inline void rvt_put_mr(struct rvt_mregion *mr)
 84 {
 85         percpu_ref_put(&mr->refcount);
 86 }
 87 
 88 static inline void rvt_get_mr(struct rvt_mregion *mr)
 89 {
 90         percpu_ref_get(&mr->refcount);
 91 }
 92 
 93 static inline void rvt_put_ss(struct rvt_sge_state *ss)
 94 {
 95         while (ss->num_sge) {
 96                 rvt_put_mr(ss->sge.mr);
 97                 if (--ss->num_sge)
 98                         ss->sge = *ss->sg_list++;
 99         }
100 }
101 
102 static inline u32 rvt_get_sge_length(struct rvt_sge *sge, u32 length)
103 {
104         u32 len = sge->length;
105 
106         if (len > length)
107                 len = length;
108         if (len > sge->sge_length)
109                 len = sge->sge_length;
110 
111         return len;
112 }
113 
114 static inline void rvt_update_sge(struct rvt_sge_state *ss, u32 length,
115                                   bool release)
116 {
117         struct rvt_sge *sge = &ss->sge;
118 
119         sge->vaddr += length;
120         sge->length -= length;
121         sge->sge_length -= length;
122         if (sge->sge_length == 0) {
123                 if (release)
124                         rvt_put_mr(sge->mr);
125                 if (--ss->num_sge)
126                         *sge = *ss->sg_list++;
127         } else if (sge->length == 0 && sge->mr->lkey) {
128                 if (++sge->n >= RVT_SEGSZ) {
129                         if (++sge->m >= sge->mr->mapsz)
130                                 return;
131                         sge->n = 0;
132                 }
133                 sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr;
134                 sge->length = sge->mr->map[sge->m]->segs[sge->n].length;
135         }
136 }
137 
138 static inline void rvt_skip_sge(struct rvt_sge_state *ss, u32 length,
139                                 bool release)
140 {
141         struct rvt_sge *sge = &ss->sge;
142 
143         while (length) {
144                 u32 len = rvt_get_sge_length(sge, length);
145 
146                 WARN_ON_ONCE(len == 0);
147                 rvt_update_sge(ss, len, release);
148                 length -= len;
149         }
150 }
151 
152 bool rvt_ss_has_lkey(struct rvt_sge_state *ss, u32 lkey);
153 bool rvt_mr_has_lkey(struct rvt_mregion *mr, u32 lkey);
154 
155 #endif          /* DEF_RDMAVT_INCMRH */
156 

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